Microsoft offers customers a range of support services, from standard support included with software licenses and subscriptions, to Premier support which can included dedicated onsite staff.
Dynamics 365 customers can also purchase something in-between - Enhanced Support for Dynamics 365, geared toward small businesses who do not purchase Premier support. This support offering provides many support and training benefits as listed below:
The price is only $5/user/month which makes it one of Microsoft's most affordable plans.
You can order Enhanced Support for Dynamics 365 on the Office 365 admin portal. Full instructions on ordering subscriptions are available here.